Declaring function pointers in C\C++ has a somewhat strange syntax, specially when you want to specify a function pointer as the return type of another function.
so here is a brief explanation:
To declare a pointer to an int called pNumber:
int *pNumber;
To declare a pointer to a function called pFunc (that has a string parameter and returns an int):
int (* pFunc)(string);
in red is the variable name, in purple is the type.
To declare a function that returns a pointer to a function:
int (* GetFuncPointer(void) )(string);
in red is a normal function declaration, in purple is the return type of that function.
S o basically int(*)(string) is the type of the function pointer.
If we want to declare a function that takes a function pointer as a parameter then we would write something like this:
void RegisterCallBack( int(*)(string) ); /* unnamed parameter */
or
void RegisterCallBack( int(*myCallback)(string) ); /* named parameter */
A prettier way to use function pointers is to use typedef to declare an alias. The typedef syntax is exactly the same as declaring a regular variable (or a function pointer).
typedef int(*FunctionPointer)(string);
now we can use FunctionPointer like this:
FunctionPointer GetFuncPointer(void);
